Script Triggers cannot be tripped directly by the user in IWP databases. You'll need to modify the design of your layout so that you can make do without them. The only way to trip a script trigger from a web browser is to click a button that performs a script. If the script's action trips the trigger (by entering a field, changing layouts, changing records, etc.), then the script associated with the trigger will be performed but not because the user entered a field, changed layouts or changed record, etc.